The bowl has come loose from the base of the toilet in my motorhome. The bowl is porcelain and the base (with the flush valve) is plastic. Looks like I will have to remove the toilet and turn it over ...
I just pulled our toilet, a Thetford Style II in our 5th wheel, because of a defective water valve. Camping world in Orlando had the parts I needed, including the rubber seal. Turned out to be a much easier repair than I had planned on having to do. Took about an hour plus the time to run to the store for the parts. We were camping in Orlando at the time.
The ceramic bowl was held to the plastic base by two bolts, after the locking tabs were turned about 1/8 of a turn.